Casing-head



H. s. MpGARRY AND J. 0. CARR.

CASING HEAD. A

APPLICATION FILED MAR. 28,1919. 4

1,352,075. 4 PatentedSe pt. 7,- 1920. 2 SHEETS-SHEET 1.

H. S. MCGARRY AND J. D. CARR. A

CASING HEAD. I

APPLICATION FILED MAR. 28, 1919.

1,352,075.- V Patent g S gg sz ggw.

f 1% 7 1H A I i l 7 I w a. A? Z wi UNITED STATES PATENT OFFICE.

HENRY S. McGARRY AND JOHN D. CARR, OF HUMBLE, TEXAS.

CASING-HEAD.

Specification of Letters Patent.

Application fil'ed March as, 1919. Serial No. 285,921.

Harris and State of Texas, have invented v certain new and useful Improvements in Casing-Heads, of which the following is a specification. This invention relates to new and useful improvements in a casing head.

One object of the invention is to provide a device of the characterdescribed, which is specially adapted for use in connection with well drilling for letting the tubing down into the bore, and in withdrawing the tubing from the bore. In drilling operations, a casing is usually let down into the bore as drilling progresses which remains in said bore permanently. As the drilling op- .erations progress, a drill stem is let down with the casing, to the lower end of which the bit is attached, and when the well is completed, a tubing is let down into the casing through "which the oil is pumped to ,the surface of the ground. The stem and tubing are each formed of joints connected by the usual couplings. When not in the well, the stem and tubing are broken up into sections usually consisting of four joints, and in letting the same down into the bore, one joint is suspended in the bore, and another screwed tothe upper end thereof, and the string then lowered gradually so that succeeding joints may be screwed onto the upper end of the string, and this process continued until all of thesections are screwed together, and thus let down into the bore; In removing the same, from the bore, the string is elevated and the section unscrewed. successively, and laid aside until the entire string is thus withdrawn and broken up. It is theobject of this invention to hold the string suspended while the sections are being screwed together in letting the string down, or unscrewed, when withdrawing the string from the bore. v

Another object of the invention resides in the provision of a casing head, which will .be closed when the tubing, through which the oil is pumped, is set in the bore.

A further feature of the invention resides in the provision of a casing head which will permit the outlet of gas, which may collect in the well, separately from the oil.

With the above and other objects in view, the invention has particular relation to certain novel features of construction, arrangement of parts, and use, an example of which is given in this specification and illustrated in the accompanying drawings, wherein:

Figure 1, shows a vertical sectional view Patented Sept. 7, 1920.

showing the tubing suspended, in the bore,

thereby, and a Fig. 2, shows a vertical sectional view, showlng the tubing in the well, and the slips removed.

Referring now more particularly to the drawings, wherein like numerals of reference designate similar parts in each of the figures, the numeral 1, refers to the casing which is permanently set in the bore, and the upper end. of which is externally threaded to receive the casing head, 2, whose lower end is threaded over said casing. This head is substantially cylindrical in form, having a central opening, the upper end of which is restricted, and which tapers downwardly, forming the opening 3, provided for the ad mission of the tubing 4. Inserted in the opening 3, there are the wedge-shaped slips 5, which are fitted in the head around the tubing 4, and whose inner faces are serrated to enga c with the tubing.

11 case it is desired to remove the tubing, 4, it is first elevated by means of elevators now commonly employed for such purposes,

until a section thereof is brought above the section of the tubing suspended into the bore, and the slips are then inserted in the opening 3, and engage with, and hold said tubing in position until another section is screwed into the. upper end thereof. The slips are then again removed, and the string further lowered into the bore, preparatory to receiving the next section, and the slips are then again inserted, and they will hold the string suspended until another section is again screwed to the upper end of the string,

let down into the bore. 1

- For the purpose. of holding the upper. endof the string in position, and of closing the upper end of the casing head, to prevent foreign objects from dropping into the casing and also to prevent the escape of gas, we have provided an annular coverin 6, which is fitted around the upper joint 0 the tubing, underneath the upper coupling 7 thereof, and which fits within the .annular recess 8, formed into the upper end of the casing head. However, before the covering is placed in position, the slips 5 are ,removed as illustrated in Fig. 2. cess is formed with the straight shoulder 9 and the vertical wall 10, extending at right angles thereto, and the covering 6 is formed to fit snugly therein to form a tight joint therewith.

.The head 2 is provided on each side with the tapped holes 9, 9, into which the plugs 10 are screwed. When the well has been completed, and the tubing 4 is let down into the well for the purpose of pumping, one

This reor both of the plu 10 may be removed to permit the outlet og any gas, which may collect in the well.

Vhat we claim is:

A device of the character described 'com-' prising a tubular member having an opening therethrough, provided to receive a pipe, said member being adapted to be screwed on the upper end of a well casing, and being provided with an annular recess in the upper end, a portion of the wall being formed with an upwardly inclined wall, and the covering adapted to fit into said recess and through which said pipe egrtends, said covering closing the openings through said tubular mem- In testimony whereof we have signed our names to this specification in the presence of twosubscribing witnesses.

. HENRY S. MCGARRY.

JOHN D. CARR. Witnesses:

E. V. HARDWAY, WM. DAvms. 

